Abstract

HPLC is used to determine the size distribution of CdS colloids. These distributions agree with those obtained from electron microscopy. The method is applied to recognize “magic” agglomeration numbers and to follow thermal particle growth and photodissolution. In the thermal growth a gradual increase in size is ascribed to Ostwald ripening. However, in the beginning a rather abrupt increase in size takes place that is ascribed to particle combination. In the photodissolution of a sample containing two size distributions, the larger particles disappear more rapidly than the smaller ones, this effect being particularly pronounced when light of longer wavelengths is used where the small particles have little absorption.

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